Automatic cut-off for gas-stoves.



No. 873,145. PATENTED DEC. 10, 190?.

J. ZILLHARDT.

AUTOMATIC GUT-OFF P-O'R GAS STOVES. V APPLICATION FILED MAR. 7. 1905. RENEWED 0012s, 1907.

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PATENTED DEC. 10, 1907.

J. ZILLHARDT. AUTOMATIC GUT-OFF FOR GAS STOVES. APPLIOATION FILED MAB. 7. 1905. RENEWED 001'. 28, 1907.

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JAKOB ZILLHARDT, OF TROY, NEW YORK, ASSIGNOR TO TIM & COMPANY, OF TROY, NEW

YORK, A CORPORATION OF NEW YORK.

AUTOMATIC CUT-OFF FOR GAS-STOVES.

Specification of Letters Patent.

Patented Dec. 10,1907.

. Application filed March '7. 1905. Serial No. 248.838. Renewed October 28. 1907. Serial No. 399.450.

' citizen of the United States, residing at Troy,

county of Rensselaer, and State of New York, have invented certain new and useful Improvements in Automatic Cut-Offs for Gas- Stoves, of which the following is a specification.

The invention relates to such improvements and consists of the novel construction and combination of parts hereinafter described and subsequently claimed. Reference may be had to the accompanying drawings, and the reference characters marked thereon, which form a part of this specification Similar characters refer to similar parts in the several figures therein.

Figure 1 of the drawings is a View in side elevation of a gas-stove provided with my improved automatic cut-off. Fig. 2 is a top plan view of the same. Fig. 3 is a central vertical longitudinal section of the same taken on the broken line 33 in Fig. 2. Fig. 4 is a central vertical longitudinal section of the pilot-light valve taken on the broken line 4-4 in Fig. 2.

The object of the invention is to automatically cut-off the supply of fuel from the main burner of a gas-stove when an article to be heated is removed from position above the burner, and to automatically turn on such supply of fuel and light the same when such an article is replaced in position above the burner.

Referring to the drawings, 1 have shown the invention applied to an ordinary form of gas-stove commonly used in laundries for heating sad-irons. The body, 1, of the stove is provided with the main burner, 2, supplied by the burner pipe, 3, with which are connected the air burner pipe, 4, and gas burner pipe 5. The burner air and gas pipes are connected through the valve-case, 6, at certain times with the respective supply air and gas pipes, 7 and 8, the latter of which is provided with a cock, 9, in the usual manner, the pipe, 7, leading from a supply of air under pressure, and the pipe, 8, from a supply of gas under pressure, neither source of supply being shown. The valve-case, 6, has four ports, aninlet-port leading from the gas supply pipe, 8, an outlet port leading to the gas burner pipe, 5, an inlet port leading from the air supply pipe, 7, and an outlet port 5 leading to the air burner pipe 1. The passage through the interior of the valve-case between the inlet ports and their respective outlet ports is controlled by a hollow cylindrical valve, 10, whichfits and is adapted to reciprocate longitudinally within the said case. This cylindrical valve is closed at its inner end, and its cylindrical wall adjacent to such closed end is adapted to close the inlet and outlet ports communicating respectively with the air supply pipe and air burner pipe,- when the valve is forced downwardly approximately to the limit of its movement within the valve-case. When, however, the valve is raised, its lower closed end is withdrawn entirely above the air ports, establishing free communication therebetween through the lower portion of the valve-case.

The hollow valve is provided with two ap ertures or ports 11 and 12, adapted, when the valve is in raised position to register with the respective gas-ports in the valve-case and establish free communication therebetween through the hollow valve. When the valve is lowered to closed position, its cylindrical walls cover and close the gas ports in the valve-case cutting off the supply of gas. The valve, 10, is adapted to be automatically operated by a lever, 13, fulcrurned at, 14, upon the body of the stove and provided with one or more offsetting members, 15, which are adapted to be depressed by an article placed above the burner upon the supporting lugs, 16. WVhen an article, as a sad-iron, is placed upon the stove, it thus serves to depress said members, 15, and the end of the lever, 13, connected therewith, causing the opposite end of the lever to be elevated, and thereby raising the valve, 10, which is thus caused to establish free communication between the two gas pipes, 5 and 8, and between the' two air pipes, 4 and 7, thus admitting a supply of air and gas to the burner pipe, 3, whence it passes to the burner 2. A coil-spring, 17, serves to restore the valve to closed position and to elevate the lever actuating members, 15, when the article is removed from the stove, thus cutting off the supply of fuel to the main burner.

To provide for automatically relighting the main burner upon the renewal of the fuel supply thereto I employ a small pilot burner, 19, fed by a small pipe, 20, leading from the gas supply pipe, 8, through a regulating valve 21. This regulating valve comprises a cylindrical casing closed at one end and provided adjacent thereto with an inlet port, 23, in its side wall and near the opposite end with an'outlet port, 24, in its side wall. A screw, 25, is inserted through the open end of this valve case which is made to tightly fit the screw, while the inner portions of the case are made to loosely fit the screw to permit a sufficient leakage of gas past the screw threads to supply the pilot burner. This supply can be regulated by inserting the screw a greater or less distance into the case to cause its inner end to cover more or less of the inlet port 23.

The pilot-burner is in continuous operation while the stove is in use whether the article to be heated is upon the stove or not. As the pilot-burner is supplied with gas unmixed with air, the same burns with a yellow flame which has a tendency to deposit soot upon an article with which it comes in contact. l/Vhen there is no article upon the stove to be heated the nature of this pilotflame is immaterial, but when there is such an article on the stove a yellow flame would be objectionable. I have therefore provided. means for mixing with the gas issuing from the-pilot burner a quantity ofimixed gas and air from the main burner sufficient to con-' vert the yellowflame into a comparatively blue flame or Bunsen flame. This I am able to accomplish by forming small holes, 26, in the main burner, opening obliquely just above the pilot burner on opposite sides thereof. When the mixed air and gas issues from the main burner it has considerable velocity due to the air pressure employed and the mixed air and gas thus issuing through said small holes, 26, mixes thoroughly with the small amount of gas issuing from the pilot burner producing a satisfactory Bunsen flame, whenever the main burner is sup-' plied with fuel, which is whenever an article is placed above the same to be heated.

What I claim as new and desire to secure by Letters Patent is In a gas-stove, the combination with a burner, and a valve-case having a cylindrical chamber ;-of air and gas pipes communicating with said burner, through said valve case which is provided with inlet and outlet ports for the respective pipes; and a hollow cylin drical slide valve fitting the interior of said valve-case having its inner end closed and its cylindrical wall adjacent thereto adapted to close the inlet and outlet ports for one set of cle placed. over the burner; and operating connections between 'said 'movable member and said valve.

In testimony whereof, I have hereunto set my hand this 1st day of March, 1905.

, JAKOB ZILLHARDT. l/Vitnesses:

LOUIS HERMAN, E. M. OREILLY. 

